As the saying goes, 'birds of a feather' - this group of artists naturally came together.
Tips
history
From the 易经·系辞上 (Yi Jing, Great Treatise): 方以类聚,物以群分 ('directions assemble by category, things divide by group'). The full modern saying is 物以类聚,人以群分 (wu yi lei ju, ren yi qun fen) - 'things gather by kind, people split into groups.'
usage
Often slightly negative - implying that bad people stick with bad people. Pair it with 人以群分 for the full impact, or use alone in either neutral or critical tones.